Issue 53669: Remove duplicate await when inlining methods.

Fixes #53669

Change-Id: I64eb73d5eef4a8a8ab5184b3e67bb2303faed5e7
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/360580
Commit-Queue: Keerti Parthasarathy <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>

Author: keertip

pkg/analysis_server/lib/src/services/refactoring/legacy/inline_method.dart

@@ -15,6 +15,7 @@ import 'package:analysis_server/src/utilities/strings.dart';
 import 'package:analyzer/dart/analysis/results.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/precedence.dart';
+import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/source/source_range.dart';
@@ -572,6 +573,12 @@ class _ReferenceProcessor {
         }
         // do replace
         var methodUsageRange = range.node(usage);
+        var awaitKeyword = Keyword.AWAIT.lexeme;
+        if (usage.parent is AwaitExpression &&
+            source.startsWith(awaitKeyword)) {
+          // remove the duplicate await keyword and the following whitespace.
+          source = source.substring(awaitKeyword.length + 1);
+        }
         var edit = newSourceEdit_range(methodUsageRange, source);
         _addRefEdit(edit);
       } else {

pkg/analysis_server/test/edit/refactoring_test.dart

@@ -1321,6 +1321,22 @@ void f() {
 ''');
   }
 
+  Future<void> test_topLevelFunction_async() {
+    addTestFile('''
+Future<int> a() async => 3;
+Future<int> b() async => await a();
+Future<int> c() async => await b();
+}
+''');
+    return assertSuccessfulRefactoring(() {
+      return _sendInlineRequest('b(');
+    }, '''
+Future<int> a() async => 3;
+Future<int> c() async => await a();
+}
+''');
+  }
+
   Future<void> test_topLevelFunction_oneInvocation() {
     addTestFile('''
 test(a, b) {